Why Isolate Your PRV With A Rupture Disc?

Using a corrosion-resistant rupture disc to isolate your PRV from corrosive process media prolongs the PRV's lifespan and allows you to use a standard carbon steel PRV valve and trim.

API Standard 527 calls for a maximum PRV seat leakage rate for metal-seated PRV's of 1.5 standard cubic feet. The leakage rate of rupture discs can be over 100 times lower to effectively reduce fugitive emissions.

Installing a rupture disc in series with your PRV will protect it against product build-up and polymerization. It also allows the PRV to be tested, which is a common maintenance requirement, without removing it from the process


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Initial Cost

Use a carbon steel valve and corrosion-resistant rupture disc to lower initial PRV investment.

Cost Of Ownership

Reduces maintenance intervals, allows for in-situ testing and prevents unplanned downtime to effectively lower the overall PRV cost of ownership.

Leakage Costs

Using a rupture disc in series with a PRV eliminates leakage, reducing product loss and cost of fugitive emissions.

How In-Situ Testing Works With ValveGuard

PRV IS1 (1)

Pressure is applied in the space via compressed air or alternative gas between the rupture disc and PRV. The pressure is manually or automatically monitored.


The pressure between the rupture disc and PRV rises to the opening pressure of both the rupture disc and PRV. As Fike's premium rupture discs can withstand a backpressure up to 1.25 times their opening pressure, the disc will not be damaged during the test cycle.


As the pressure reaches the opening pressure of the PRV, it will open. The measured opening pressure can now be compared to the rated nominal opening pressure of the PRV to determine if it is functioning within its design parameters - all without removing the PRV.

White Paper - Rupture Discs in Combination of Pressure Relief Valves

Download the following white paper to learn more about ValveGuard, including:

  • How close to the PRV should rupture discs be installed?
  • What should be the rupture disc's burst pressure in relation to the PRV's set pressure?
  • What are the advantages of installing a rupture disc downstream of the PRV?
  • What is "parallel use" of a rupture disc and how does it support PRVs?

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